22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

The CHASE laboratory search for chameleon dark energy

23 Jul 2010, 14:40
13m
Salle 251 ()

Salle 251

Parallel Session Talk 11 - Particle Astrophysics and Cosmology 11 - Particle Astrophysics and Cosmology

Speaker

Jason Steffen (Fermilab)

Description

A scalar field is a favorite candidate for the particle responsible for dark energy. However, few theoretical means exist that can simultaneously explain the observed acceleration of the Universe and evade tests of gravity. The chameleon mechanism, whereby the properties of a particle depend upon the local environment, is one possible avenue. I present the results of the Chameleon Afterglow Search (CHASE) experiment, a laboratory probe for chameleon dark energy. CHASE marks a significant improvement over other searches for chameleons both in terms of its sensitivity to the photon/chameleon coupling as well as its sensitivity to the classes of chameleon dark energy models and standard power-law models. Since chameleon dark energy is virtually indistinguishable from a cosmological constant, CHASE tests dark energy models in a manner not accessible to astronomical surveys.

Primary author

Jason Steffen (Fermilab)

Presentation Materials